Re: Tips for the newer members
My best tip for China motors: buy and use a tap set. It's very likely the holes have not been tapped to the bottom leading to short threading the studs into the block. When that happens it's very possible to pull the threads right out of the block. Then you have to deal with tapping the hole out to the next larger size, usually SAE standard, and getting new bolts. The other solution is to tap what is left and use JB Weld.
Get an inch-pound torque wrench and use it. M6 bolt to no more than 128 inch pounds or 8 foot pounds.
You can get both tools at Harbor Freight for around $32 total. Not using them can turn your block to trash.